i rebuilt my own 200 4r and its been working just fine. read the book read the book. take your time, keep it in order. keep it clean, and double ckeck everthing (twice). talked to a tranny fella and he told me how people started working on their own tranny and then screwed it up and then thought he could fix it. I'm retired so time wasn't a problem. while my toy stayed warm in the garage, i built the tranny. lots of fun. so much so, that i built a second one. extra clutches bigger valves upgraded relieved pump now that i've done mine, i can't figure out why more of us are not using the 200 4r. IL kept my 350 tranny put away incase my kids someday want to put it back to stock after im gone. but for now i've got my cake (tranny) and eating (driving) it to.